Li Na of China reaches for a shot to Dominika Cibulkova of Slovakia during their women's singles final. (Eugene Hoshiko/AP)

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Lukasz Kubot and Robert Lindstedt

Lukasz Kubot of Poland, left, and Robert Lindstedt of Sweden, hold the trophy after defeating Eric Butorac of the U.S. and Raven Klaasen of South Africa in their men's doubles final. (Eugene Hoshiko/AP)

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Celebraion

Lukasz Kubot of Poland, right, and Robert Lindstedt of Sweden, left, celebrate after defeating Eric Butorac of the U.S. and Raven Klaasen of South Africa in their men's doubles final. (Aaron Favila/AP)

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Robert Lindstedt and Lukasz Kubot

Robert Lindstedt of Sweden, right, and Lukasz Kubot of Poland, play Eric Butorac of the U.S. and Raven Klaasen of South Africa in their men's doubles final.(Aaron Favila/AP)

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Rafael Nadal

Rafael Nadal of Spain celebrates after defeating Roger Federer of Switzerland during their semifinal. (Aaron Favila/AP)

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Roger Federer

Roger Federer of Switzerland walks off the Rod Laver Arena after his semifinal loss to Rafael Nadal of Spain during their semifinal. (Andrew Brownbill/AP)

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Rafael Nadal

Rafael Nadal of Spain makes a backhand return to Roger Federer of Switzerland during their semifinal. (Rick Rycroft/AP)

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Roger Federer

Roger Federer of Switzerland serves to Rafael Nadal of Spain during their semifinal. (Rick Rycroft/AP)

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Stanislas Wawrinka

Stanislas Wawrinka of Switzerland celebrates after defeating Tomas Berdych of the Czech Republic during their semifinal. (Rick Rycroft/AP)

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Tomas Berdych

Tomas Berdych of the Czech Republic mis-hits the ball against Stanislas Wawrinka of Switzerland during their semifinal. (Aijaz Rahi/AP)

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Dominika Cibulkova

Dominika Cibulkova of Slovakia throws a racket as she celebrates after defeating Agnieszka Radwanska of Poland during their semifinal. (Eugene Hoshiko/AP)

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Stanislas Wawrinka

Stanislas Wawrinka of Switzerland serves to Tomas Berdych of the Czech Republic during their semifinal. (Andrew Brownbill/AP)

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Agnieszka Radwanska

Agnieszka Radwanska of Poland serves to Dominika Cibulkova of Slovakia during their semifinal.(Eugene Hoshiko/AP)

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Dominika Cibulkova

Dominika Cibulkova of Slovakia reacts on the net as she plays Agnieszka Radwanska of Poland during their semifinal. (Rick Rycroft/AP)

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Li Na

Li Na of China celebrates after defeating Eugenie Bouchard of Canada during their semifinal at the Australian Open in Melbourne, Australia.(Aaron Favila/AP)

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Eugenie Bouchard

Eugenie Bouchard of Canada cools down with ice towel around her neck during a break as she plays Li Na of China during their semifinal at the Australian Open in Melbourne, Australia.(Rick Rycroft/AP)

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Roger Federer

Roger Federer of Switzerland celebrates after defeating Andy Murray of Britain during their quarterfinal at the Australian Open in Melbourne, Australia.(Aaron Favila/AP)

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Andy Murray

Andy Murray of Britain reacts after losing a point during his quarterfinal against Roger Federer of Switzerland at the Australian Open in Melbourne, Australia.(Andrew Brownbill/AP)

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Rafael Nadal

Rafael Nadal of Spain celebrates a point won over Grigor Dimitrov of Bulgaria during their quarterfinal at the Australian Open in Melbourne, Australia. (Aijaz Rahi/AP)

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Grigor Dimitrov

Grigor Dimitrov of Bulgaria lies on the court between points as he plays Rafael Nadal of Spain during their quarterfinal at the Australian Open in Melbourne, Australia. (Aijaz Rahi/AP)

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Rafael Nadal

Rafael Nadal of Spain serves to Grigor Dimitrov of Bulgaria during their quarterfinal at the Australian Open in Melbourne, Australia.(Eugene Hoshiko/AP)

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Agnieszka Radwanska

Agnieszka Radwanska of Poland makes a forehand return during her quarterfinal against Victoria Azarenka of Belarus at the Australian Open in Melbourne, Australia.(Andrew Brownbill/AP)

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Victoria Azarenka

Victoria Azarenka of Belarus reacts after losing a point during her quarterfinal against Agnieszka Radwanska of Poland at the Australian Open in Melbourne, Australia.(Eugene Hoshiko/AP)

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Dominika Cibulkova

Dominika Cibulkova of Slovakia celebrates after defeating Simona Halep of Romania during their quarterfinal at the Australian Open in Melbourne, Australia.(Eugene Hoshiko/AP)

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Stanislas Wawrinka

Stanislas Wawrinka of Switzerland celebrates after defeating Novak Djokovic of Serbia in their quarterfinal at the Australian Open in Melbourne, Australia.(Rick Rycroft/AP)

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Novak Djokovic

Novak Djokovic of Serbia celebrates a point won against Stanislas Wawrinka of Switzerland in the fourth set of their quarterfinal at the Australian Open in Melbourne, Australia.(Aaron Favila/AP)

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Tomas Berdych

Tomas Berdych of the Czech Republic celebrates after defeating David Ferrer of Spain during their quarterfinal at the Australian Open in Melbourne.(Rick Rycroft/AP)

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Ana Ivanovic

Ana Ivanovic of Serbia receives a medical treatment as she plays Eugenie Bouchard of Canada during their quarterfinal at the Australian Open in Melbourne, Australia.(Aaron Favila/AP)

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Eugenie Bouchard

Eugenie Bouchard of Canada makes a forehand return to Ana Ivanovic of Serbia during their quarterfinal at the Australian Open in Melbourne, Australia. (Rick Rycroft/AP)

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Li Na

Li Na of China makes a forehand return to Flavia Pennetta of Italy during their quarterfinal at the Australian Open in Melbourne, Australia.(Aaron Favila/AP)

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Maria Sharapova

Maria Sharapova of Russia reacts after missing a point against Dominika Cibulkova of Slovakia during their fourth-round match at the Australian Open. Sharapova, the women's third seed, lost in three sets. (AP Photo/Eugene Hoshiko)

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Dominika Cibulkova

The hair of Dominika Cibulkova flies as she serves to Maria Sharapova during their fourth-round match at the Australian Open. (AP Photo/Aaron Favila)

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Sloane Stephens

Sloane Stephens of the U.S. looks puzzled after she lost a point to Victoria Azarenka during their fourth-round match at the Australian Open. Stephens lost the match in straight sets. (AP Photo/Aaron Favila)

Ana Ivanovic of Serbia celebrates her win over Serena Williams of the U.S. during their fourth round match. (Andrew Brownbill/AP)

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Ana Ivanovic and Serena Williams

Ana Ivanovic of Serbia, left, is congratulated by Serena Williams of the U.S. after Ivanovic's fourth round win. (Aaron Favila/AP)

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Andy Murray

Andy Murray of Britain, center, signs autographs for fans after his win over Feliciano Lopez of Spain during their third round match. (Aijaz Rahi/AP)

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Flavia Pennetta

Flavia Pennetta of Italy bites the net in frustration during her fourth round match against Angelique Kerber of Germany. (Eugene Hoshiko/AP)

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Tennis supporters

Tennis supporters perform in third round match between Donald Young of the U.S. and Kei Nishikori of Japan. (Shuji Kajiyama/AP)

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Caroline Wozniacki

Caroline Wozniacki of Denmark reaches for a shot to Garbine Muguruza of Spain during their third round match. (Eugene Hoshiko/AP)

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Rafael Nadal

Rafael Nadal of Spain celebrates his win over Gael Monfils of France during their third round match. (Eugene Hoshiko/AP)

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Angelique Kerber

Angelique Kerber of Germany makes a backhand return to Flavia Pennetta of Italy during their fourth round match. (Aaron Favila/AP)

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Andy Murray

Andy Murray of Britain rushes for a return shot to Feliciano Lopez of Spain during their third round match. (Rick Rycroft/AP)

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Gael Monfils

Gael Monfils of France plays a shot to Rafael Nadal of Spain during their third round match.(Eugene Hoshiko/AP)

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Roger Federer

Roger Federer of Switzerland plays a shot to Teymuraz Gabashvili of Russia during their third round match. (Aaron Favila/AP)

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Andy Murray

Andy Murray of Britain makes a backhand return to Feliciano Lopez of Spain during their third round match. (Rick Rycroft/AP)

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Jelena Jankovic

Jelena Jankovic of Serbia hits a forehand return to Kurumi Nara of Japan during their third round match.(Rick Rycroft/AP)

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Novak Djokovic

Novak Djokovic of Serbia reaches for a return shot to Denis Istomin of Uzbekistan during their third round match. (Andrew Brownbill/AP)

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Richard Gasquet

Richard Gasquet of France falls as he plays Tommy Robredo of Spain during their third round match.(Rick Rycroft/AP)

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Milos Raonic

Milos Raonic of Canada makes a forehand return to Grigor Dimitrov of Bulgaria during their third round match. (Andrew Brownbill/AP)

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Maria Sharapova

Maria Sharapova of Russia serves to Alize Cornet of France during their third round match. (Shuji Kajiyama/AP)

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Fabio Fognini

Fabio Fognini of Italy leaps for a shot to Sam Querrey of the U.S. during their third round match. (Eugene Hoshiko/AP)

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Serena Williams

Serena Williams of the U.S. celebrates after defeating Daniela Hantuchova of Slovakia in their third round match. (Aaron Favila/AP)

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Roger Federer

Roger Federer of Switzerland plays a forehand return to Blaz Kavcic of Slovenia during their second round match. (Rick Rycroft/AP)

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Sloane Stephens

Sloane Stephens of the U.S. makes forehand return during her second round match against Ajla Tomljanovic of Croatia. (Eugene Hoshiko/AP)

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Andy Murray

Andy Murray of Britain makes a forehand return to Vincent Millot of France during their second round match. (Aaron Favila/AP)

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Serena Williams

Serena Williams of the U.S. tosses the ball for a serve during her third round match against Daniela Hantuchova of Slovakia. (Aaron Favila/AP)

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Rafael Nadal

Beads of the sweat drop off from the nose of Rafael Nadal of Spain during his second round match against Thanasi Kokkinakis of Australia. (Eugene Hoshiko/AP)

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Jo-Wilfried Tsonga

Jo-Wilfried Tsonga of France celebrates after defeating Thomaz Bellucci of Brazil during their second round match. (Rick Rycroft/AP)

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Magdalena Rybarikova

Magdalena Rybarikova of Slovakia serves to Kurumi Nara of Japan during their second round match. (Shuji Kajiyama/AP)

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Benoit Paire

Benoit Paire of France smashes his racket in frustration during his second round match against Nick Kyrgios of Australia. (Eugene Hoshiko/AP)

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Angelique Kerber and Alison Riske

Angelique Kerber, left, of Germany is congratulated by Alison Riske of the U.S. during their third round match. (Rick Rycroft/AP)

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Juan Martin del Potro

Juan Martin del Potro of Argentina walks from the court after losing to Roberto Bautista Agut of Spain in their second round match. (Andrew Brownbill/AP)

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Lightning

The lightning is seen in the sky at an outside court. (Shuji Kajiyama/AP)

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Maria Sharapova

Maria Sharapova of Russia wraps an ice-towel around her head during a break in her second round match against Karin Knapp of Italy at the Australian Open in Melbourne, Australia. Temperatures are expected to top 44cC (112 F) during play today. (Aaron Favila/AP)

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Alize Cornet

Alize Cornet of France celebrates after winning her second round match against Camila Giorgi of Italy at the Australian Open in Melbourne, Australia. (Eugene Hoshiko/AP)

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Kei Nishikori

Kei Nishikori of Japan cools down with ice pack on his face during their second round match against Dusan Lajovic of Serbia at the Australian Open in Melbourne, Australia. (Shuji Kajiyama/AP)

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Novak Djokovic

Novak Djokovic of Serbia makes a forehand return to Leonardo Mayer of Argentina during their second round match at the Australian Open in Melbourne, Australia.(Aaron Favila/AP)

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Australian Open

A photographer sits next to a frying pan and cooks two eggs as temperatures are expected to top 44C (112 F) during the second round matches at the Australian Open in Melbourne, Australia. (Rick Rycroft/AP)

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Roger Federer

Roger Federer of Switzerland serves to James Duckworth of Australia during their first round match at the Australian Open in Melbourne, Australia. (Eugene Hoshiko/AP)

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Australian Open

A spectators pours water over himself to cool down as play was suspended when organizers implemented the Extreme Heat policy during second round matches at the Australian Open in Melbourne, Australia. (Joshua Baker/AP)

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Serena Williams

Serena Williams of the United States serves to Vesna Dolonc of Serbia during their second round match at the Australian Open in Melbourne, Australia, Wednesday.(Aaron Favila/AP)

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Australian Open

The sun sets over the Melbourne central business district skyline as Spain's Rafael Nadal and Australia's Bernard Tomic prepare to play their first round match on Rod Laver Arena at the Australian Open in Melbourne, Australia.(Eugene Hoshiko/AP)

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Andy Murray

Andy Murray of Britain returns to Go Soeda of Japan in their first round match at the Australian Open in Melbourne, Australia.(Rick Rycroft/AP)

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Ana Ivanovic

Ana Ivanovic of Serbia makes a backhand return to Kiki Bertens of the Netherlands during their first round match at the Australian Open in Melbourne, Australia.(Rick Rycroft/AP)

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Victoria Azarenka

Victoria Azarenka of Belarus celebrates after defeating Johanna Larsson of Sweden in their first round match at the Australian Open in Melbourne, Australia.(Eugene Hoshiko/AP)

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Rafael Nadal

Rafael Nadal of Spain holds drink bottle during a break in his practice session ahead of the Australian Open in Melbourne, Australia. (Rick Rycroft/AP)

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David Ferrer

David Ferrer of Spain makes a backhand return to Adrian Mannarino of France during their second round match at the Australian Open in Melbourne, Australia.(Rick Rycroft/AP)

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Ernests Gulbis

Ernests Gulbis of Latvia smashes his racket during his second round match against Sam Querrey of the U.S. at the Australian Open in Melbourne, Australia.(Eugene Hoshiko/AP)